| Explanations |
| (1) A typical 13-15 1NT Opener.
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| (2) A classic hand where Stayman is the perfect answer.
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| (3) South denies a 4-card Major.
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| (4) Here North passes whatever South bids. If South has no 4-card Major then it is odd-on that they have a 3-card Diamond suit [unless exactly 3325] and even a 5-2 Diamond fit will play better than 1NT. |
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